Lab.gruppen drew upon the amplifier design philosophies developed for the PLM 20000Q, evolving these to create new circuit topologies and control features. The result is a new amplifier platform called IDEEA. The challenge was maintaining Lab.gruppen’s impeccable sonic performance and robust power output while meeting the rigorous efficiency requirements of Energy Star 2.1. The challenge was met: reducing current draw during operating cycles with vigorous program material and high output levels, and reducing power consumption during non-operational cycles.
The E Series incorporates a high-headroom universal power supply accepting any mains voltage from 70 to 265 V at 50 or 60 Hz. A higher storage capacity in the power supply prevents excessive draw on the mains inlet during repeated peak bursts, maintaining extra headroom on the supply rails for sustained maximum output with minimal distortion. The Class D output stage is highly efficient, while the inherently bridged topology allows up to twice the rated power output on one channel when the other channel is unused or driving a low power application. The new Rail Sensing Limiter is the latest refinement of Lab.gruppen’s proprietary approach to optimizing amplifier output characteristics to match the connected load. Each channel has a two-position switch that sets the output for driving either low impedance or high impedance (70 V) loudspeaker systems, with a +4 dBu sensitivity regardless of load type.